From b4b83d34766a410848d33e8bee24b3d1fb7f1ec1 Mon Sep 17 00:00:00 2001 From: Thomas Schwinge Date: Sat, 19 Apr 2025 20:52:08 +0000 Subject: In 'libgomp/target.c:gomp_unmap_vars_internal', defer 'gomp_remove_var' An upcoming change requires that 'gomp_remove_var' be deferred until after all 'gomp_copy_dev2host' calls have been handled. Do this likewise to how commit 275c736e732d29934e4d22e8f030d5aae8c12a52 "libgomp: Structure element mapping for OpenMP 5.0" changed 'gomp_exit_data'. libgomp/ * target.c (gomp_unmap_vars_internal): Queue splay-tree keys for removal after main loop. --- libgomp/target.c | 36 ++++++++++++++++++++---------------- 1 file changed, 20 insertions(+), 16 deletions(-) diff --git a/libgomp/target.c b/libgomp/target.c index 76fa4b9..43f33c9 100644 --- a/libgomp/target.c +++ b/libgomp/target.c @@ -2242,6 +2242,9 @@ gomp_unmap_vars_internal (struct target_mem_desc *tgt, bool do_copyfrom, false, NULL); } + size_t nrmvars = 0; + splay_tree_key remove_vars[tgt->list_count]; + for (i = 0; i < tgt->list_count; i++) { splay_tree_key k = tgt->list[i].key; @@ -2263,17 +2266,22 @@ gomp_unmap_vars_internal (struct target_mem_desc *tgt, bool do_copyfrom, (void *) (k->tgt->tgt_start + k->tgt_offset + tgt->list[i].offset), tgt->list[i].length); + /* Queue all removals together for processing below. + See also 'gomp_exit_data'. */ if (do_remove) - { - struct target_mem_desc *k_tgt __attribute__((unused)) = k->tgt; - bool is_tgt_unmapped __attribute__((unused)) - = gomp_remove_var (devicep, k); - /* It would be bad if TGT got unmapped while we're still iterating - over its LIST_COUNT, and also expect to use it in the following - code. */ - assert (!is_tgt_unmapped - || k_tgt != tgt); - } + remove_vars[nrmvars++] = k; + } + + for (i = 0; i < nrmvars; i++) + { + splay_tree_key k = remove_vars[i]; + struct target_mem_desc *k_tgt __attribute__((unused)) = k->tgt; + bool is_tgt_unmapped __attribute__((unused)) + = gomp_remove_var (devicep, k); + /* It would be bad if TGT got unmapped while we're still iterating over + its LIST_COUNT, and also expect to use it in the following code. */ + assert (!is_tgt_unmapped + || k_tgt != tgt); } if (aq) @@ -4244,7 +4252,7 @@ gomp_exit_data (struct gomp_device_descr *devicep, size_t mapnum, false, NULL); } - int nrmvars = 0; + size_t nrmvars = 0; splay_tree_key remove_vars[mapnum]; for (i = 0; i < mapnum; i++) @@ -4307,10 +4315,6 @@ gomp_exit_data (struct gomp_device_descr *devicep, size_t mapnum, errors if we still have following element siblings to copy back. While we're at it, it also seems more disciplined to simply queue all removals together for processing below. - - Structured block unmapping (i.e. gomp_unmap_vars_internal) should - not have this problem, since they maintain an additional - tgt->refcount = 1 reference to the target_mem_desc to start with. */ if (do_remove) remove_vars[nrmvars++] = k; @@ -4325,7 +4329,7 @@ gomp_exit_data (struct gomp_device_descr *devicep, size_t mapnum, } } - for (int i = 0; i < nrmvars; i++) + for (i = 0; i < nrmvars; i++) gomp_remove_var (devicep, remove_vars[i]); gomp_mutex_unlock (&devicep->lock); -- cgit v1.1